See Stars in the Dark

Persephone Donnovan is a beautiful, young, ambitious, caring and funny girl. A cousin of James Potter. Her whole family is all about stopping Voldemort. Her mother and father are focusing all their time on the right cause. At the cost of missing all the main milestones of their daughter's life. Still, Persephone holds no grudge, she loves her parents and would admit to no one how much their absence in her life hurts her. But here comes Regulus Black. Possessing the same reserved persona, as her parents have. Unknowingly the boy that just wants to be left alone and clean of the Gryffindor's overly friendly golden girl (by the order of his parents) had sparked her interest far more than anyone in the whole world.

"Why do you care so much?"

"...Because why not?"